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SPF, joe jobs, and phishing

SPF, joe jobs, and phishing

Posted Jun 15, 2006 18:13 UTC (Thu) by dwmw2 (subscriber, #2063)
In reply to: SPF, joe jobs, and phishing by rfunk
Parent article: SPF on vger

There are much better solutions to the problem of bounces to joe-jobs. Solutions which don't require wholesale changes to the way that email works.


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SPF, joe jobs, and phishing

Posted Jun 15, 2006 19:32 UTC (Thu) by dlang (subscriber, #313) [Link]

like what?

SPF, joe jobs, and phishing

Posted Jun 15, 2006 21:32 UTC (Thu) by dwmw2 (subscriber, #2063) [Link]

You didn't actually read the why not SPF page linked above, did you?

In particuar, I was thinking of BATV. Not only does it instantly stop the bounces to mail you didn't actually send, but it also allows others to detect fake mail. Try faking MAIL FROM:<dwmw2@infradead.org> to any site which bothers with sender verification callouts to avoid mail from invalid addresses (like sourceforge, amongst many others).
550-Verification failed for <dwmw2@infradead.org>
550-Called:   2001:4bd0:203e::1
550-Sent:     RCPT TO:<dwmw2@infradead.org>
550-Response: 550-This address never sends messages directly, and should not accept bounces.
550-550-Please see http://www.infradead.org/rpr.html or contact
550-550 postmaster@infradead.org for further information.
550 Sender verify failed

SPF, joe jobs, and phishing

Posted Jun 22, 2006 23:51 UTC (Thu) by kitterma (subscriber, #4448) [Link]

How many of those solutions are accessible to someone who doesn't run their own dedicated mail server?

SPF, joe jobs, and phishing

Posted Jun 15, 2006 19:35 UTC (Thu) by rfunk (subscriber, #4054) [Link]

Note that I mentioned bounces being only part of the problem with
joe-jobs.

SPF, joe jobs, and phishing

Posted Jun 22, 2006 23:48 UTC (Thu) by kitterma (subscriber, #4448) [Link]

None of which are implementable by someone who isn't running their own mail server and using custom software. With SPF, with all it's flaws, any domain owner that can publish a TXT record in their DNS can gain some protection.

SPF checking may be relatively rare, but in my experience it is enough that within a month of publishing a -all SPF record, bounce messages due to forged sending using my domains ended. There is enough SPF checking going on to provide deterrence.

SPF is a horrible idea in theory. In practice, unless your user base sends to peope who do a lot of forwarding, it works pretty well for many domains. Eventually, it will be obsolete because something better will come along. In the meantime, it does the job for me and lots of others.


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